Damper for fireplaces



(No Model.) 2 Sheets-Sheet 1.

11.; J. JOHNSON. DAMPER FOR FIREPLAGES.

No. 509,911. Patented 1380.5,1893;

INVENTOR ml NAYmNAL LrmoaRAPHma couPAuv. wAumuToN. 0. a,

(No M 2 Sheet-Sheet 2.

E. J. JOHNSON. DAMPER FOR FIREPLAGES.

\ No. 509,911. Patented Dec. 5, 1893.

A 7TORNEYS.

Uivrrnn STATES PATENT Curios.

ERICK J. JOHNSON, OF CHICAGO, ILLINOIS.

DAMPER FOR FIREPLACES.

SPECIFICATION forming part of Letters Patent No. 509,911, dated December 5, 1893.

Application filed February 21, 1893. Serial No. 463,173. (No model.)

To all whom it may concern:

Be it known that I, ERICK J. JOHNSON, of Chicago, in the county of Cook and State of Illinois, have invented a new and Improved Damper for Fireplaces, of which the followmg is a full,'clear, and exact description.

The invention relates to dampers such as shown and described in the Letters Patent No. 463,333, granted to me November 17, 1891.

The object of the present invention is to provide a new and improved damper for fireplaces, which is simple and durable in construction, very effective in operation, and arranged to conveniently swing the damper plate into an angular position in the throat of the fireplace, and to support it automatically in that position.

The invention consists of a cam adapted to engage the pivoted damper plate, to swing the same up or down in the throat of the fireplace and to lock it in position.

The invention also consists of certain parts and details and combinations of. the same, as will be fully described hereinafter and then pointed out in the claims.

Reference is to be had to the accompanying drawings forminga part of this specification, in which similar letters of reference indicate corresponding parts in all the figures.

Figure l is a transverse section of the improvement as applied. Fig. 2 is an enlarged transverse section of the improvement on the line 2-2 of Fig. 3. Fig. 3 is a sectional side elevation of the same on the line 3-3 of Fig. 2. Fig. 4 is a plan view of the same; and Fig. 5 is a transverse section of the improvement as arranged in an angular throat.

The fireplace A connects by the throat B with the chimney C in the usual manner, the said throat being arranged either horizontally, as illustrated in Fig. 1, or angularly as shown in Fig. 5. In the throat B is arranged aframe D set in the walls of the fireplace and having an opening therein, and provided on top, near the front edge, with lugs E forming hearings for the trunnions F of the damper plate F adapted to swing up or down to open and close the opening in the frame D, so as to regulate the draft in the fireplace.

On the under side of the damper plate F, and near the middle of the same, is arranged a transversely extending rib F adapted to be engaged by the rim of a segmental cam G having its hub G secured on a transversely extending rod H mounted to turn in apertures D formed in the projection D secured on or formed integral with the frame D, at the under side thereof.

The forward end of the rod H passes loosely through an opening in the fireplace frame A and on the extreme outer end of the said rod is secured a suitable knob or handle H for conveniently turning the said rod so as to turn the cam G to swing the damper plate F' up or down to open and close the opening inthe frame D, thus regulating the draft of the fireplace.

When the frame D is applied to a fireplace A having an angular throat D connecting with the chimney C, as shown in Fig. 5, then the frame D is set to the angle of the throat and the rod H is then passed through a second set of apertures D arranged in the projectionD so that the rod H extends horizontally, as is plainly shown in the said figure.

As illustrated in Fig. 3, the peripheral surface of the segmental cam G is formed with a series of notches Gr each adapted to form a seat for the rib F so that when the operator stops turning the rod H, when swinging the plate F upward or downward, then the rib seats itself in the corresponding notch, thereby locking the cam in place and at the same time supporting and locking the plate F in an angular position.

It is understood that the center of the se mental cam G is eccentric to the center of the rod H on which the cam is secured, and the cam is adapted to engage, with its outer end, a lug F projecting from the under side of the plate F at the outer end of the rib F so that when the plate F is in its uppermost position, as shown in Fig. 2, the lug F and the rib F engage the rim of the cam at the same time.

In order to prevent disengagement of the cam G, I provide a rod I, which extends over the lug F and through the cam Gr to a lug F" secured on the plate F near its center line, as is plainly shown in Fig. 2.

In order to accommodate the inner end of the rod H at the time the frame I) is set in the angular throat D, as shown in Fig. 5, I provide the plate F with a recess F arranged on the under side and adapted to receive the ICO inner end of the rod H at the time the plate F is closed or fully seated on the frame D.

It will be seen that by the arrangement described the cam G not only serves to impart 5 an up and down swinging motion to the plate 2. The damper operating cam G in the form of an open segment provided on its curved edge with teeth G and having an aperture G toreceive the operating rod, substantially as set forth.

3. The combination with the open frame and the damper hinged thereto and provided.

on its lower face with a transverse guiderod or loop I, of the operating rod provided at its inner end with an open segmentalcam through which saidrod or loop I passes and said cam engaging the lower face of the damper, substant'iall y as set forth.

at right angles to the outer end of said rib and the guide'rod I, substantiallyas set forth.

4'. A damper for fireplaces, comprising a pivoteddamper' plate provided on its under side with a transversely extending rib, and a cam mounted to turn and engaging the said rib to impart a swinging motion to the damper plate, the rim of the said cam being formed witli notehes forming seats for the said rib, substantially as shown and described.

5. A damper for fireplaces, comprising a pivoted damper plate provided on its under side with a transversely extending rib,-a cam mounted to turn and engaging the said ml) to impart a swinging motion to the damper plate, and a fixed rod held on the said pivoted damper plate and passing through the said cam to prevent disengagement of the latter from thedamper plate, substantially as shown and described.

6; A damper for fireplaces, provided with an open frame adapted to be set in the throat of the fireplace and formed at its under side with a projection having sets ofapertures forming bearings for the damper rod, substantially as shown and described.

ERICK J. JOHNSON.

Witnesses:

JOHN B. J EFFERY, JOHN C. KENT. 

